Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e1c73228bebc55…

MALICIOUS

PDF

72.3 KB Created: 2021-09-22 19:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 239d29e3741618086f74df50fbe316f9 SHA-1: 4335ef44f791e5622da59ad4858ff07fd35c1251 SHA-256: 55e1c73228bebc558e8e8c924881ee8628868ecb9ce66c0a26f8a64757c1929a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8113

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=anime+moving+wallpaper+for+android PDF link annotation
    • http://korsorlampang.net/user_img/files/30553114855.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/05706237c38653ef129d88e0139bbac1/29109215318.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/82510439564.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/25867046097.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091101384973499.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/97485481972.pdfIn PDF document text
    • https://777mto.com/contents/files/dekor.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210910011051.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/dajarasezalupum.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/pewawovagev.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/sezenukeluvonaw.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/tapigivijedodeti.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631461580.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/rotuzububamujapoka.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/wolexavodevo.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/424889f687d970d9d3c6443d554276f9/62280362000.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/xoluvatosipabijizimazumu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/xuxivibibap.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/92343892019.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF97 10708 bytes
SHA-256: 1eaddd37e93d0c1bb831a86b6aff6abc89f8a3f544235b6c1a66b733e5c7cb47
font_01_sfnt_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 17132 bytes
SHA-256: 9dbb0e8428ea22f69a54467801429895362508db0f1298630453a261705866cb
font_02_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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